JPH06193630A - Linear guide device - Google Patents

Abstract

PURPOSE:To embody an accurate linear slide motion, the improvement of stiffness and low noise by moving front and rear two pairs of track rings to be rolled on rail disc so as to be brought in mutual contact on their insides. CONSTITUTION:When a slider A is, for example, moved upward, a right-hand track ring 3 is rotated clockwise, while a left-hand track ring 3' is rotated counterclockwise, so as to be rolled on a rail disc B while respective circular arc-like grooves (C) are engaged with cylinder rails 7, 7'. At this time, lateral reactions to be applied to the cylinder rails 7, 7' from the track rings 3, 3' are not only individually supported by respective track rings 3, 3', but both rings can bear the lateral load uniformly because the right and left track rings 3, 3' are brought in mutual contact to move the cylinder portion (D) on the center side of the slider A, moreover, the rotations of both frack rings 3, 3' are carried out uniformly in lateral direction and actively due to respective rolling effects.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear guide device for smoothly performing a linear movement of a mechanical structural member, which can obtain a smooth and light movement in a linear direction and an operation with low noise.
The present invention relates to a linear guide device that can obtain sufficient rigidity in other directions.

[0002]

2. Description of the Related Art Linear motion bearings are roughly classified into a rail type, a round shaft type, and a flat plate type according to the formation of rails. The present invention is of the rail type which can cope with a composite load. And, among them, linear motion belongs to the category of infinite form. This type of conventional product rolls balls or rollers in the corresponding track and the load track groove formed in the slider. The purpose is achieved by returning the rolling element outlet to the original rolling element outlet through a return circuit provided in the slider.

According to this type of structure, the balls or rollers as rolling elements inevitably have a small diameter due to overall dimensional restrictions, and the rotation speed of the rolling elements at a specific linear motion speed increases. Also, due to the structure of the return circuit, it is difficult to equip a retainer for rolling elements, and therefore friction between rolling elements, pressing operation in the return circuit, and when the rolling elements separate from the load track or rejoin. Noise is generated, and more noise is generated in a system using a spacer ball between each load ball. Not only does this noise increase in proportion to the linear motion speed, but it also increases the wear of related parts.

In addition to this, there is a linear guide in which a track roller is axially attached to a slide carriage and is rolled on a rail. However, since each track roller is individually supported by the carriage, it is added to the carriage. The load in the lateral direction is concentrated only on the track roller rolling on the load-side rail, and there is a drawback that only the wear of the members related thereto is particularly advanced.

[0005]

In order to eliminate such drawbacks, the ball or roller that rolls and circulates between the slider and the rail is abolished, and two pairs of front and rear track wheels axially attached to the slider are provided. By directly engaging the linear motion guide portion of the railroad track and making the pair of rail wheels contact each other, it is possible to obtain highly accurate and smooth operation and appropriate rigidity.

[0006]

Therefore, according to the present invention, two pairs of front and rear track wheels are axially mounted on the same plane of the slider body, and arc-shaped grooves or inclined portions are formed on the outer circumferences of these track wheels. Then, a cylindrical rail or V installed on the corresponding railroad board
The load bearing force in the direction other than the linear motion direction is secured by engaging the shaped groove, moving the cylindrical parts of each pair of front and rear rails to each other, and applying a preload as necessary. It is intended to reduce noise and wear by increasing the diameter of rolling rolling wheels.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the present invention, in which A
In manufacturing, the slider is composed of the main body 1 and the upper plate 2, and two pairs of track wheels are axially mounted on the same plane of the slider main body 1 in the front and rear spaces. The two pairs of front and rear track wheels 3 and 3'shown in FIGS. 1 and 2 have the same structure as a known deep groove ball bearing, and each inner ring a is axially fixed to the slider A by the support shafts 4 and 4 '. There is. The outer ring b is composed of a plurality of balls 6 held by a retainer 5 between the slider body 1 and the upper plate 2.
It is rotatably supported by, and an arcuate groove (a) and a cylindrical portion (b) are formed on the outer periphery thereof.

On the other hand, corresponding to the linear movement of the slider A, cylindrical rails 7 and 7'are provided on the inner surfaces of both walls of a rail board B having a U-shaped cross section, and the rail wheels 3 and 3 are provided on the rails. The arcuate grooves (a) formed on the outer ring b of ′ are engaged with each other. The outer ring cylindrical portion (b) of each of the track wheels 3 and 3 ′ has a structure in which the pair of front and rear track wheels are pressed and rolled on the center side of the slider A.

The two pairs of front and rear track wheels 8 and 8'shown in FIG.
Similar to the case of FIGS. 1 and 2, the slider body 1 is axially supported on the same surface, but the respective track wheels 8 and 8 ′ are disc-shaped, and the slide bearings 9 and 9 ′ are interposed therebetween. Are supported on the slider A by supporting shafts 5 and 5 '. Slopes c and c'are formed vertically on the outer circumferences of the track wheels 8 and 8 ', and V formations 10 and 10' are formed in the track direction on the inner surfaces of both walls of the track board B opposite to the slider A. Then, the vertically inclined portions c, c'of the respective track wheels 8, 8'are engaged with this. At the same time, the cylindrical portion (b) at the center of the inclined portion of the track wheels 8 and 8'rolls under pressure on the center side of the slider A for each pair of front and rear track wheels, as shown in FIGS. It is similar to the case. 11 is a slider A
Is a ball screw displayed as one means for driving the linear movement direction.

Since the embodiment of the present invention is constructed as described above, when the slider A moves upward, for example, in FIG. 1, the right side of the two pairs of front and rear track wheels 3, 3 '. Track wheel 3 rotates clockwise and the left track wheel 3'rotates counterclockwise, and the respective arcuate grooves (a) are engaged with the cylindrical rails 7 and 7'of the railroad board B for continuous rolling. To do. At this time, the track wheels 3, 3 '
The lateral reaction force applied to the cylindrical rails 7 and 7'from the rails 3 and 3'is not only supported individually by the respective rails 3 and 3 ', but also the left and right rails 3 and 3'are located at the center side of the slider A. Since the cylindrical portion (b) is moved, both wheels can bear the lateral pressure evenly, and the rolling effects of each of them enable the left and right wheels 3, 3'to rotate left and right uniformly and actively. Done.

In addition to the above operation, since two pairs of the tracking wheels 3 and 3'are provided in front of and behind the slider A, the tracking wheels 3 and 3'are provided.
There are four engaging parts between 3'and the cylindrical rails 7 and 7 ',
It is possible to sufficiently secure the rigidity of the slider A in the yawing direction. Further, the contacting portions between the arcuate grooves (a) of the track wheels 3 and 3'and the columnar rails 7 and 7'of the railroad board B can be set at two upper and lower positions depending on the shape of the grooves (a). It is possible to cope with the vertical load applied to the slider A and the loads in the pitching direction and the yawing direction.

Next, in the case of the tracking wheels 8 and 8'shown in FIG. 3, the fact that the outer peripheral cylindrical portion (b) is moved toward the center of the slider A means that the tracking wheels 3 and 3'are in contact with each other. As in the case
Therefore, lateral rigidity and smooth operation can be obtained. Further, the engagement of the respective rail wheels 8, 8'with the V-shaped grooves 10, 10 'of the railroad board B is such that the upper and lower inclined surfaces c and c'on the outer periphery of the rail wheels are respectively the upper inclined surfaces of the V-shaped grooves 10, 10'. Since the slider A is brought into contact with the lower sloping surface and corresponds to the load in the horizontal direction as well as the load in the vertical direction, the slider A can withstand a complex load and can perform a light motion. Therefore, sufficient rigidity can be maintained even with respect to the pitching, yawing, and rolling loads applied to the slider A.

In the above V-shaped groove bearing type slide,
When the vertically inclined parts c, c of the track wheels 8, 8'are formed in a slightly arcuate shape, the differential slip generated at the rolling parts of the track wheels is reduced and a lighter sliding motion is obtained. As with the arcuate groove method, it can be adapted to linear drive of precision equipment.

[0014]

As described above, in the linear guide device of the present invention, the diameter of the rail portion and the rolling wheel that rolls is sufficiently larger than the width of the slider, and the rotation speed of the rolling wheel at a predetermined speed of the slider. However, since it is significantly reduced compared to the conventional rolling pair, the noise generation rate is low and the wear of the track wheels is small. In particular, each track wheel is axially mounted on the same plane of the slider by its respective support shaft, and in order to obtain an infinite linear motion, there is no circulating movement of the rolling elements as in the conventional device, so that these motions are accompanied. The occurrence of various noises and wear is minimal.

Further, since the two pairs of track wheels are brought into contact with the cylindrical portions on the central side of the slider, the two wheels have good drivability for linear motion and can receive loads evenly. Therefore, since the composite load is supported with a high degree of rigidity, even when a preload (preload) is applied to the rail portion, each of the rail wheels can evenly bear the force.

In particular, the contact effect of the cylindrical portion of the track wheel is that the lateral load applied to the slider, for example, when a rightward load is applied to the slider in FIGS. 2 and 3, this load is on the right side. Not only is the rail wheel 3 or 8 supported, but it is also exerted on the left rail wheel 3'or 8'rolling with it, so the load on the load-side race wheels is dispersed by the support members of the left and right rail wheels. It will be supported. Therefore, the wear of each track wheel support portion is relatively reduced, the characteristic linear sliding effect can be maintained for a long period of time, and if the load is equivalent, the shaft wheel support member of the track wheel can be made compact.

Further, the above-mentioned arrangement of the rail wheels is arranged in the upper and lower portions.
If a total of four pairs are installed, it is possible to construct a slide device that is more resistant to compound loads and moment loads, and the railboard with a U-shaped cross section gives an appropriate preload to the track wheels by the elastic effect. It is also possible.

As described above, since the overall load balance is good and there are few factors causing errors, highly accurate linear motion can be obtained, and noise is not generated even at high speed driving. It is highly useful with both conditions.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a plan view in which a part of an upper plate of a slider is cut away.

FIG. 2 is a cross-sectional view taken along the line S-S shown in FIG.

FIG. 3 shows another embodiment of the present invention and is a cross-sectional view of a track wheel shaft attachment portion corresponding to FIG.

[Explanation of symbols]

 A Slider B Rail plate 3 3'Track wheel motion 4 4'Support shaft 7 7'Cylindrical rail 8 8'Track rail of other shape 10 10 'V-shaped groove

Claims (2)

[Claims] 1. A pair of front and rear track wheels are axially mounted on the same plane of a slider, and arc-shaped grooves are formed on the outer circumference of the track wheels. A linear guide device, characterized in that the cylindrical parts of each pair of track wheels are brought into contact with each other while being engaged. 2. The linear guide device according to claim 1, which has two pairs of rail wheels that are in contact with each other, wherein upper and lower inclined portions are formed on the outer circumference of each rail wheel, and these are installed on the rail board. Linear guide device that rolls by engaging with a V-shaped groove.